Two.
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The 2 diagonals of a trapezium are only equal when its in the form of an isosceles trapezium.
Oh, dude, a trapezium can have two perpendicular diagonals. Yeah, it's like those lines that meet at right angles and stuff. So, if you're ever in a trapezium and need to find some right angles, just look for those diagonals. Easy peasy.
There are 5 diagonals in a pentagon
No
Parallelograms or isosceles trapezium.